Opportunities and problems in modification of levels of rapeseed C18 unsaturated fatty acids |
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Authors: | G Rakow D I McGregor |
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Affiliation: | (1) Research Station, Research Branch, Canada Agriculture, University Campus, S7N OX2 Saskatoon, Saskatchewan, Canada |
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Abstract: | Selections for different levels of C18 fatty acids in rapeseed to date have had only limited success, due in part to the low frequency of occurrence of desired
genotypes with increased linoleic and decreased linolenic acid. In the progeny of mutation experiments with seeds of the variety
Oro (linolenic acid content 8–10%) two stable mutants were selected, one with 5% and the other with 20% linolenic acid in
the seed oil. The level of linoleic acid in the two mutants is the same as Oro (16–20%), but the levels of oleic and linolenic
acids are inversely altered. In this paper several problems associated with selecting for linoleic and linolenic acids, which
became apparent during the mutation studies, are discussed. Many selections made from the mutated material were unstable,
reverting to the original Oro fatty acid composition after two or three self-pollinated generations. This fact plus environmental
and maternal effects made selection difficult. However, with the use of rapid and simple analytical methods and space-saving
growing techniques, these difficulties were overcome.
One of six papers presented in the symposium “Rapeseed Marketing and Breeding,” AOCS Meeting, Ottawa, September 1972. |
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